<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr />
    <textarea placeholder="请输入要评论的内容，最多120字" maxlength="120" v-model="msg"></textarea>

    <mt-button type="primary" size="large" @click="postComment">提交评论</mt-button>

    <div class="cmt-list">
      <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_times">
        <div
          class="cmt-title"
        >第{{i+1}}楼&nbsp;&nbsp;用户：{{item.user_name}}&nbsp;&nbsp;发表时间：{{item.add_time|dateFormat}}</div>
        <div class="cmt-body">{{item.content==='undefined' ? '此用户很懒':item.content}}</div>
      </div>
    </div>

    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>
<script>
export default {
  data() {
    return {
      pageIndex: 1, //展示默认第一页数据
      comments: [],
      msg: ""
    };
  },
  created() {
    this.getComments();
  },
  methods: {
    async getComments() {
      const res = await this.$http.get(
        "/getcomments/" + this.id + "?pageindex=" + this.pageIndex
      );
      //每次获取的时候不要把老数据清空
      this.comments = this.comments.concat(res.data.message);
    },
    getMore() {
      this.pageIndex++;
      this.getComments();
    },
    async postComment() {
      const res = await this.$http.post(
        "/postcomment/" + this.id,
        (this.content = this.msg.trim())
      );
      var cmt = {
        user_name: "匿名用户",
        add_time: Date.now(),
        content: this.msg.trim()
      };
      this.comments.unshift(cmt);
      this.msg='';
    }
  },
  props: ["id"]
};
</script>
<style lang="scss" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }
}
.cmt-list {
  margin: 5px 0;
  .cmt-item {
    font-size: 13px;
    .cmt-title {
      line-height: 30px;
      background-color: #ccc;
    }
    .cmt-body {
      line-height: 35px;
      text-indent: 2em;
    }
  }
}
</style>
